Learner's definition of SIGNIFICANT
[more significant; most significant]
1 : large enough to be noticed or have an effect
A significant number of customers complained about the service.
He won a significant amount of money.
There is a significant difference in prices between the two stores.
The study found a statistically significant decrease in symptoms in patients who had taken the drug.
His influence on me was significant. = He had a significant influence on me.
2 : very important
a significant event in the history of our nation
Fish is a significant part of their diet.
It is significant that she never mentioned him.
3 : having a special or hidden meaning